RESUMO

Eavesdropping is a widespread behaviour among animals, providing the receiver with valuable information to assess the habitat, resources or threats. This kind of behaviour has been reported for the burrowing owl (Athene cunicularia), which in its northern range lives in close association with fossorial mammals and eavesdrops on their alarm calls as indicators of risk. In their southernmost range, burrowing owls do not associate with mammals, but they are often found sharing foraging and nesting patches with the southern lapwing (Vanellus chilensis), a noisy, territorial and aggressive plover species. We designed a field experimental study aimed at determining if burrowing owls are able to use lapwing calls as indicator of potential risk. We exposed focal owls to a sequence of sounds including lapwing alarm calls, and biological and non-biological controls, and registered their response as alert or relax behaviours. Linear mixed modeling showed that owls increased their alert behaviour in response to lapwing alarm calls but not in response to control treatments. In addition, owls' response was consistent between habitats (rural and urban) and seasons (breeding and non-breeding). Our results suggest that eavesdropping is a generalized strategy of burrowing owls to acquire environmental information throughout its distribution range.

Assuntos

RESUMO

The objective of this study was to describe lesions in four birds, victims of collisions with aircraft, coming from the International Airport of Recife/Guararapes Gilberto Freyre, Pernambuco, Brazil. Contused wounds were predominant in birds in this study, characterized by the presence of fractures, bruises and hematomas and justified by the blunt action promoted by the type of vulnerant agent involved (aircraft). The analysis under medico-legal veterinary aspect of lesions in bird strike is essential, because in addition to the attempt to establish a standard for differentiating the aircraft lesions, it can guide the bird strike hazard management programs at airports, since the necropsy allows the identification of the species involved or at least facilitates the obtaining biological material for identification.(AU)

Assuntos

RESUMO

ABSTRACT The objective of this study was to describe lesions in four birds, victims of collisions with aircraft, coming from the International Airport of Recife/Guararapes Gilberto Freyre, Pernambuco, Brazil. Contused wounds were predominant in birds in this study, characterized by the presence of fractures, bruises and hematomas and justified by the blunt action promoted by the type of vulnerant agent involved (aircraft). The analysis under medico-legal veterinary aspect of lesions in bird strike is essential, because in addition to the attempt to establish a standard for differentiating the aircraft lesions, it can guide the bird strike hazard management programs at airports, since the necropsy allows the identification of the species involved or at least facilitates the obtaining biological material for identification.

RESUMO

Pertencente à família Charadriidae, o quero-quero (Vanellus chilensis) ocorre da América Central até a América do Sul, sendo bastante tolerante a locais antropizados. Em cativeiro, os filhotes da espécie ainda não são mantidos sem os cuidados parentais, desta forma o presente trabalho propôs criar um protocolo de manejo sob cuidados humanos para estes filhotes. Para este estudo, foi comparado o desenvolvimento de filhotes neste novo protocolo com o de filhotes em vida livre, utilizando um total de treze filhotes. A alimentação sob cuidados humanos foi composta por ração MegaZoo® O-20, ovo cozido e larvas de besouro tenébrio (Tenebrio mollitor) vivas. Como resultado, os filhotes em cativeiro alcançaram uma maior massa corporal e um melhor índice de sobrevivência. Tais discrepâncias foram decorrentes da ausência de predadores, da dieta e da pouca atividade encontrada no ambiente sob cuidados humanos. Pode-se concluir que o manejo sugerido no presente trabalho obteve êxito na manutenção dos filhotes sob cuidados humanos, porém necessita de trabalhos complementares voltados a um melhor condicionamento e ambientação dos filhotes.

Belonging to the Charadriidae family, the southern lapwing (Vanellus chilensis) occurs from Central to South America, being quite tolerant of anthropized sites. Under captivity, the chick of the species are still not kept without parental care, in this way the present work proposed to create a protocol of management under human care for these chicks. For this study, we compared the development of chicks in this new protocol with free-living chicks, using a total of thirteen chicks. Feeding under human care was composed of MegaZoo® O-20 ration, boiled egg and live beetle larvae (Tenebrio mollitor). As a result, chicks in captivity achieved a higher body mass and a better survival rate. Such discrepancies were due to the absence of predators, diet and low activity found in the environment under human care. In general, it can be concluded that the present work succeed in keep the chicks under human care, but complementary work are needed aimeing at better conditioning and setting of the chicks.

Assuntos

RESUMO

Pertencente à família Charadriidae, o quero-quero (Vanellus chilensis) ocorre da América Central até a América do Sul, sendo bastante tolerante a locais antropizados. Em cativeiro, os filhotes da espécie ainda não são mantidos sem os cuidados parentais, desta forma o presente trabalho propôs criar um protocolo de manejo sob cuidados humanos para estes filhotes. Para este estudo, foi comparado o desenvolvimento de filhotes neste novo protocolo com o de filhotes em vida livre, utilizando um total de treze filhotes. A alimentação sob cuidados humanos foi composta por ração MegaZoo® O-20, ovo cozido e larvas de besouro tenébrio (Tenebrio mollitor) vivas. Como resultado, os filhotes em cativeiro alcançaram uma maior massa corporal e um melhor índice de sobrevivência. Tais discrepâncias foram decorrentes da ausência de predadores, da dieta e da pouca atividade encontrada no ambiente sob cuidados humanos. Pode-se concluir que o manejo sugerido no presente trabalho obteve êxito na manutenção dos filhotes sob cuidados humanos, porém necessita de trabalhos complementares voltados a um melhor condicionamento e ambientação dos filhotes.(AU)

Belonging to the Charadriidae family, the southern lapwing (Vanellus chilensis) occurs from Central to South America, being quite tolerant of anthropized sites. Under captivity, the chick of the species are still not kept without parental care, in this way the present work proposed to create a protocol of management under human care for these chicks. For this study, we compared the development of chicks in this new protocol with free-living chicks, using a total of thirteen chicks. Feeding under human care was composed of MegaZoo® O-20 ration, boiled egg and live beetle larvae (Tenebrio mollitor). As a result, chicks in captivity achieved a higher body mass and a better survival rate. Such discrepancies were due to the absence of predators, diet and low activity found in the environment under human care. In general, it can be concluded that the present work succeed in keep the chicks under human care, but complementary work are needed aimeing at better conditioning and setting of the chicks.(AU)

Assuntos